Umhh...you're looking at the end result ( CPU performance ) and blaming only one factor that contributes to that performance : process.
Alongside process, performance and performance/watt is dependent on architecture and circuit design.
I really doubt BD is perfect uarch and implementation wise and only the process is to blame. If we would have someone from GF here, I'm sure he'd say not so nice things about AMD competence in CPU design.
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